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  <a name="EN-US_TOPIC_0000002164814062"></a><a name="EN-US_TOPIC_0000002164814062"></a>
  <h1 class="topictitle1">Disks Fail to Be Opened Using VDDK During VMware VM Backup</h1>
  <div>
   <div class="section">
    <h4 class="sectiontitle">Symptom</h4>
    <p>During a VMware VM backup job, disks fail to be opened using VDDK. In subsequent backup jobs, VDDK fails to be initialized.</p>
   </div>
   <div class="section">
    <h4 class="sectiontitle">Possible Causes</h4>
    <p>The number of VM disks opened in NBDSSL mode on a single ESXi host reaches the upper limit of 52.</p>
   </div>
   <div class="section">
    <h4 class="sectiontitle">Troubleshooting</h4>
    <ol>
     <li><span>Restart the client service.</span><p></p>
      <ol type="a">
       <li>Use PuTTY to log in to the host where the client is to be installed as user <strong id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002164790296_en-us_topic_0000002200031305_b916917212">root</strong>.</li>
       <li>Run the following command to go to the <strong id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_b14842192941413">ProtectClient</strong> directory:
        <div class="note" id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_note13958111815513">
         <img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span>
         <div class="notebody">
          <p id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_en-us_topic_0000001792390220_p1655195845015"><span id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_ph58441642194017">In the command, <em id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_en-us_topic_0000002164630536_i2153220484">/opt</em> is the default installation directory of the client. Replace it with the actual installation directory.</span> The following operations use <strong id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_b925794917581">/opt</strong> as an example.</p>
         </div>
        </div> <pre class="screen" id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_screen79234411411">cd /opt/DataBackup/ProtectClient</pre></li>
       <li>Run the following command to stop the client service:<pre class="screen" id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_screen39264412140">sh stop.sh</pre></li>
       <li>Run the following command to start the client service:<pre class="screen">sh start.sh</pre></li>
      </ol> <p></p></li>
     <li><span>Perform the backup job again. If the problem persists, reinstall the client.</span></li>
    </ol>
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     <strong>Parent topic:</strong> <a href="en-us_topic_0000002200054965.html">FAQs</a>
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